My bad.
Pradeep, if you want tight bass go for a smaller sub.The bigger ones will give you thump but they aren't that tight.
Sorry buddy, but this is not true. Had this been true, component drivers (6.5") would have give tightest bass.
To achieve a tight bass we need 3 things:
1. Sealed box made to EXACT specs - most important.
2. A sub with crisp and short travel of the diapharm.
3. An amp that is rated same or a lil above the MAX RMS of the sub.
Anyday a 12" driver shall generate more energy than a 10"/8" driver. A very nice example is RF P3D212, superbly amazing and fast sub. Another budget option is RF P1 which is just too fast for it's price.